Quick question re: port mapping

Does the 802.11n base station have the same limit as the 802.11g base station regarding the maximum number of ports that the user can map?
In other (perhaps more coherent) words: The "g" base station only allows a user to specify a total of 20 ports in the "port mapping" pane of Advanced settings. Does the "n" station have the same limitation?

Anyone have any ideas or information? I'm not able to find anything clear by searching the knowledge base, etc.

Similar Messages

QUICK QUESTION ABOUT PORTS

Hi, I have a quick question about port forwarding/mapping. My question, lets say I am running MSN messenger, who's ports are 6880-6900. But lets say I am running a torrent application or something else that requires those ports. If both applications were running at the same time, would this cause interference with them on the same ports or now. Thanks
Nathan

Normally, only one application can listen to a specific port number at a time. If MSN is grabbing those 21 ports then your torrent app won't be able to run.
However, most apps don't work that way - even if they use multiple ports, they don't use them all at the same time, so MSN might use 6880 when it starts up, leaving the others open for other applications to use if needed.
Only experimentation will answer that one.

Port mapping question - I need clarification

I have posted a question about port mapping previously but - although I thought I understood - it is still not working for me. I was hoping there was a kind soul out there who could humor me and explain port mapping with AEBS 802.11n as if there where talking to a 5 year old.
Thanks for the help and it's ok to laugh.

{quote:}This address MUST be outside of the range of IP addresses that your 802.11n AirPort Extreme Base Station's (AEBS) DHCP service is providing.{quote}
This actually is incorrect.
The statement that the mapped internal address must be static is correct; otherwise the AEBS will not, if the Mac is assigned a different dynamic (DHCP) IP address by the AEBS some time in the future, be able to forward packets to the Mac. However it is very straightforward to have the Mac computer be assigned an address dynamically by the AEBS and to have the AEBS always assign the same IP address to the same Mac computer. Thereby giving the Mac a static address inside the DHCP range.
In the AirPort utility go to Internet | DHCP | DHCP Reservations. Click "+" then enter the MAC (what Apple calls Ethernet ID if you are using wired or AirPort ID if wireless) hardware address of the Mac computer, give it an IP address, save it. Then that Mac computer will always receive that (static) IP address from the AEBS.
Why do this? Well by continuing to use DHCP (while having though a static IP address) you keep all the other benefits of DHCP such as automatically having the gateway address, the DNS server addresses given to the Mac. Otherwise you have to enter all this information manually on the computer if you put it outside the DHCP address range. This is very desirable, especially for most home users, as their DNS server entries are provided by their ASP and picked up by the AEBS. If the ASP changes DNS addresses the manually configured Mac machine will not know.
So in summary - for port forwarding it is NOT necessary for the Mac machine to be outside the DHCP range, in fact _it is desirable to keep it in the DHCP range_ *as long as* the Mac utilises DHCP reservation on the AEBS.
I have tested this and it works fine.

FTP & Port Mapping?

Ok, I'm pretty new to wireless networking but I have a pretty good grasp of it all. I just have one question about Port Mapping and security. I have to open port 21 on Port Mapping in order for me to use FTP to upload files to my webspace. My question is how safe is it to leave that port open all the time? Or should I continue to close the port after everytime I upload? That's fine but it takes so long to update the Express with the new settings and reset. Kind of a pain.
Anyway, if anyone has an opinion or suggestion for this then it would be greatly appreciated!

Thanks for the quick reply and information Henry!
Well, I guess I would be at minor risk since I don't have my OS X firewall enabled. I just figured that the Express was a better firewall. But if you start punching holes in the wall then it becomes less secure. Hmm.... I guess I would have to enable the OS X firewall then if I want to leave the port mapping enabled on the Express. And just enable FTP access through the OS X firewall when needed.
Of course I have good password protection on the FTP server but then again I would have the port wide open too.
Anyway.... thanks again for your help! It definitely helps me put things in order with what I need to do.

Port Mapping Question

Well, I thought I had this all figured out...
About a year ago I set up an older AirPort Extreme Base Station (Version 5.7) successfully to port to an iMac running OS X Tiger Server. As Leopard came out I decided that I wanted to do a little upgrading around the house and purchased the new AEBS along with a Mac Mini to run the new server software.
I have no problems getting the AEBS set up, but the port mapping just doesn't seem to work correct.
Right now I reverted back to the old system and seem to be serving just fine on the Mac Mini with OS X Leopard Server... But I'd really like to leverage the new AEBS.
So, anyone out there can offer some advice on one of the settings I seem to be missing that seems to make this not work?
Thanks

It might also be a DCHS/NAT problem...
Here's a post I added this morning...
http://discussions.apple.com/thread.jspa?threadID=1320615&tstart=0

ARD AE Port Mapping Question

Hello. I have a LAN consisting of 5 macs hardwired with an eithernet switch, and connected to an Airport Extreme and a DSL modem. They all have static IPs. I want to be able to administer these computers with ARD via the internet from a remote location. I know that I need port mapping to do this, but am having trouble setting it up properly. Right now I can connect to one computer remotely (I have the ARD ports mapped to it, but don't know how to set up additional port mapping, so I can get to the rest of the machines on the LAN. Mapping them to the same ports doesn't work. Can someone help me out? Thanks!

mshanks, Welcome to the discussion area!
You would need to use different public ports for each machine. For example, if the ARD service running on each Mac uses port 5000 (I don't know which port this is only an example) and you have 5 Macs configure the port mapping to do the following:
public port 5000 -> Mac_0 on private port 5000
public port 5001 -> Mac_1 on private port 5000
public port 5002 -> Mac_2 on private port 5000
public port 5003 -> Mac_3 on private port 5000
public port 5004 -> Mac_4 on private port 5000

Quick Question about Cisco 3560 and the Web Device Manager

Alright, I have a quick question that I am curious about but I haven't found any information
about it.
When I log into my Cisco 3560 using the web portal to get to the Device Manager. Below the
diagram of the switch, then under the Dashboard there is section called Switch
Health, Port Utilization.
Under the Switch Health there is Bandwidth Used, Packet Error. Those two options just sit
at zero and do not move. The Port tilization graph is also sitting at zero.
Is there a way to make them functional?

Anyone notice performance increase or decrease of their HD when using the nVidia IDE SW drivers? particularly with a 74GB Raptor? I've also heard of burner issues when installing the IDE SW but have not used my burner yet.

Port mapping converting gui to cli

Hi,
I am having an issue with a new office LAN implementation and I was wondering if anyone can help.
The current setup has a Linksys router and there are port mappings for the servers for a inside and outside port. This has been input via GUI. I am upgrading to a 3845 router and have converted the GUI input to Cisco CLI. This however does not work and the LAN does not behave as it did before.
The Linksys GUI input is attached.

Hi @samdilloway,
A few questions for you:
Did you check if those servers can go to the internet?
Is the NAT functioning properly when they go outside?
Here is a link of a page with the step-by-step process of the port mapping configuration. Make sure you're doing it exactly like that:
http://kb.linksys.com/Linksys/ukp.aspx?pid=80&vw=1&articleid=21470
Also, a link of a TSHOOT page for the same problem:
http://kb.linksys.com/Linksys/ukp.aspx?pid=80&vw=1&articleid=22385
To be sure, the problem that you have is that users from outside cannot access to the services your mapping, right?
Let me know your answers.
HTH.
Don't forget to rate.
Rgrds,
Martin, IT Specialist

Quick Question - iDoc 'empty' fields?

Hi eveyone!
Quick question before leaving for holiday
I just finished my scenario 'iDoc to JDBC (Stored Procedure)' and it works just fine.
But, I realize that if a field is empty IN THE IDOC, this field is not COMING to SAP-PI, therefore, I can't map it to the Stored Procedure.
Is this behavior normal? I mean, the field not come from iDoc because is empty?
(I can see the field in the segment, WE19 in R3 (empty), but not in WE02 neither in the INCOMING of SAP-PI Monitor, it's just not there, because it's empty at the origin).
I´m just 'afraid' I would have to do this special treatment for EACH field...:(
Thanks guys!
Ricardo Sancio Lóra
Brazil

Is this behavior normal? I mean, the field not come from iDoc because is empty?
Empty fields are not shown in PI monitoring, so it's ok.
I´m just 'afraid' I would have to do this special treatment for EACH field...:(
If the fields at target side are mandatory then you need to take care in mapping.

Fixed and 2 quick questions (bios thread)

Hi Everyone, i need your help again...
[....]. since i installed Win2k3 on my system i was getting stability problems, especially lockups to black screen in games. On Win2k3 i was using the exact same drivers as I am going to list soon, and so I thought I'd install Windows XP again on a spare hard drive to see if this helped. I wish i'd never messed with my system my previous XP install was almost 100% stable, but that's another story.
Today I perfomed these steps in this order:
1)Downloaded SP1a
2)formatted new hard drive
3)Booted from CD, did a Windows XP Pro install
4)Started XP Pro, installed SP1a
5)Installed Nforce system drivers and Display Drivers 29.42 (these were very good to me before...) and restarted
6)Installed Speedtouch USB ADSL Drivers 2.0.1.2 and went online
6.5)Enabled Hardware Acceleration on Displayt Properties
6.7) Installed direct x 9.0a web setup.
7)Did full windows update: all the critical stuff, most of the recommended (except MEssanger, Media Player and a couple others) and the CPU driver (left my Gfx and Sound on the above)
8) After a restart started a game
It lasted all of 10 seconds once I started playing.
Ok, maybe 5 seconds. Smae as Win2k3!!! I was running bios default performance options, with APIC off... so I ran Prime 95 for a while, got no errors .... about to try a memtest86 but I'm pretty cetrain the memory is good never had trouble with it before at all and I've tested it before too.
Can someone help me out? Here's my hardware config
[size=11]
AMD XP 1900+ (no overclock any more)
MSI K7N420D MB
2*512MB DDR266 Samsung 'Transcend' Memory (unbranded really) (16 chip DIMMs)
Geforce 2 MX400 32MB SDRAM (unbranded - runs a little faster then onboard graphics)
Adaptec 29160LP Scsi Card
IBM 16000rpm 32GB SCSI Disk (UW-2)
2*WD1000BB 100GB Western Digital IDE Drives (the normal ones with 2mb cache) in Software Raid - 0 on Promise card
18GB Maxtor ATA66 IDE hd on Nforce, with CDR.
a Promise Ultra TX100 Dual IDE Controller card (for CD Rom + expansion)
Enermax 431w PSU / 7200rpm fan on heavy HS.
Windows XP SP1 / DX 9.0a (going to reformat to Win2003)
[/SIZE]
I could really do with anyone's working driver config for a windows XP sp1a system, and how to build it from the bottom up. If a given driver config that works 100% for others fails for me I can start hardware troubleshooting and cursing loudly, otherwise with any luck it'll fix my problem.... please help me out i know there are people out there still running NForce 1 boards!
Quick question that could help: what sound driver revision from windows update should i be using? I can get the archived ones....
Thanks,
Naveen.
PS If i manage to fix it i'll update here, but i need a hand plz

.... also, I have the same errors running the same game from Win2k3 on a SCSI drive through the PCI bus (adaptec 29160) on the 2.7 bios. It looks like there is still an issue with fast PCI bus read/writes, sound usage and AGP card usage causing crashes. Discounting the OS change and APIC, I have these scenarios:
1) Game running off IDE drive on Nforce IDE ports: fine
2) Running of IDE drives on promise controller card: fails, locks.
3) Running off scsi drive on Adaptec 29160 card: fails, game locks.
So we may still have an issue with PCI read/writes and stability on bios 2.7 and Nforce system drivers 2.03 ... which is big news really.
I hope one of the moderators can put MSI in the picture and get them or NVidia to look into this. I can try eliminating APIC and the OS/Drivers from the issue, and install the game on all 3 drive configurations to confirm the above if necessary, but it's what it looks like from here. Using Performance bios defaults with no overclock, underclocking didnt help.
Perhaps bios 2.4 will fix this in which case the bios still needs work, 2 years on.
Naveen

New Airport Extreme (802.11n): : Port Mapping... ***???

There are two different programs I was formerly using, whereby (after following instructions) I was able to create a static IP address for every machine on my network, plus open ports 8000 and 9990-9998 respectively. But ever since upgrading to the new Airport Extreme (802.11n), it completely stopped working. To boot, I've upgraded to Leopard on one of two of the machines (the other is still using 10.3.9).
I haven't been able to figure out for the life of me, how to configure it. It's no longer as obvious where and what information to put in. All guides that would remotely help are designed for the older Airport unit, which has completely different menus in the Airport Utility.
Is there anyone out there who has experience with Dot-Tunes and/or Nicecast or similar port mapping, who has the patience to describe, in layman's terms, what steps to take to get this set up correctly again, starting with how to reassign static IPs for my machines. I will not ask a lot of questions and take up too much more of your time. I'm just frustrated after a whole day of trying to figure this out and fruitless Google and forum searches.
Thank you so much.

I'm not familiar with either Dot-Tunes or Nicecast, but the following would be the general port mapping procedure with the 802.11n AirPort Extreme Base Station (AEBSn) using the AirPort Utility. Note in this procedure you will not need to assign a static IP address for each of your host devices. Instead you will be taking advantage of the AEBSn's DHCP reservations feature.
To setup port mapping on an AEBSn, either connect to the AEBSn's wireless network or temporarily connect directly, using an Ethernet cable, to one of the LAN port of the AEBSn, and then use the AirPort Utility, in Manual Setup, to make these settings:
1. Reserve a DHCP-provided IP address for the host device.
Internet > DHCP tab
o On the DHCP tab, click the "+" (Add) button to enter DHCP Reservations.
o Description: <enter the desired description of the host device>
o Reserve address by: MAC Address
o Click Continue.
o MAC Address: <enter the MAC (what Apple calls Ethernet ID if you are using wired or AirPort ID if wireless) hardware address of the host computer>
o IPv4 Address: <enter the desired IP address>
o Click Done.
2. Setup Port Mapping on the AEBSn.
Advanced > Port Mapping tab
o Click the "+" (Add) button
o Service: <choose the appropriate service from the Service pop-up menu>
o Public UDP Port(s): <enter the appropriate UDP port values>
o Public TCP Port(s): <enter the appropriate TCP port values>
o Private IP Address: <enter the IP address of the host server>
o Private UDP Port(s): <enter the same as Public UDP Ports or your choice>
o Private TCP Port(s): <enter the same as Public TCP Ports or your choice>
o Click "Continue"
(ref: "Well Known" TCP and UDP ports used by Apple software products)

Port map to more than one 'private IP address'

Hi,
probably a silly question, but ...
Is it possible to port map on an Airport Express to more than one private IP address? IOW, if the first IP address is not available/active, then the port is forwarded to the second IP address.
Grant

Hi iFelix,
yes, I have 2 networks, home & studio. I take my powerbook with me between the 2. When I am in one of them, I want to be able to control the other.
At the moment, I can map to another machine (not my powerbook) in the Airport Express settings and then I can connect via VNC. If however, I want to have a more complete control, I need to map port 3283 specifically to my powerbook. Obviously, if the powerbook is with me, then it's not where I'm not, if you follow the rather Pooh bear logic.
My problem would be solved if I could map to one IP address as default, with a second if that address were not resolved/found/available.
As for VPN, yes as I have gleaned from much browsing of net and these forums, this would solve my problem, but it seems overly complicated to set up for a non-IT person. Looking at the interface for a router/modem is a frightening thing for people who only do this once in a blue-moon.
Grant
AluBook 17

CDP quick question

Hi quick question,
Scenario looks like this:
ASR1k --- ASR9k -- ASR9k --- ASR1k
The connection between ASR1ks are l2transport on the ASR9k side. Therefore we see the ASR1k as a CDP neighbor from the other ASR1k. This is fine, but my question is why we also see the ASR9k as a CDP neighbor from the ASR1k via the same port. I thought CDP should either be tunnelled or not.
So, CDP on the ASR1ks show both the other ASR1k (which is fine), but it also show the directly connected ASR9k via the same interface. Is this normal?
Thanks,
Federico.

Adam, thanks for taking care of this and you are correct.
We made a change, based on popular demand to peel out certain control traffic out of the untagged EFP in the existence of MST/CDP configuration.
If the service is not configured locally on the l2tranporting interface then those packets are subject to the EFP transport.
cheers!
xander

Port mapping doesn't seem to work - AEBS

I have a dsl connection to an Alcatel SpeedTouch 530 modem, linked via ethernet cable to the WAN of my AEBS, which shares the connection to three Macs and 2 Win boxes. I want to connect to aMule and get a High-ID. In the wiki.amule.org FAQ it states that to achieve this, I must use port mapping behind a firewall, and map ports 4662 (TCP) and 4665 (UDP) to my machine (which, after reading http://discussions.apple.com/thread.jspa?messageID=607426&#607426, I have assigned to AirPort TCP/IP address 10.0.1.201, by the way).
Unfortunately, it doesn't seem to work, and I'm still getting the annoying 'low-ID' warnings on aMule.
Following some advice on the aMule forum, I mapped port 80 and verified that the WebServer is accessible inside the wLan, if that's of any help.
Thanks, people.

Hi Tim, a couple of questions:
1. If I go ahead and un-check the 'Distribute IP
addresses' box, how will the three Macs and two Win
computers on this wlan be affected? Do we still have
access to each other's shares, and do we still access
the internet through the AEBS?
Once you turn off the 'distribute the IP address box' then your alcatel router will then distribute ip adresses and your macs and wintel boxes will still be on the same network and using the sharepoints will remain the same if you setup the shares using the bonjour names.
I am making an assumption here in that your alcatel box is setup as a NAT router and not as a Bridge.
2. Do I just give a static internal IP to my own
powerbook, or to all the above computers?
You only need to give a static ip to the mac your doing the port forwarding to. So that is the mac that is running the p2p software, infact you would do the same for any computer on the LAN that would run a server, such as a webserver, email server etc.
Many thanks, as always.
You are welcome.
PS I had the impression that the basic idea of what I
need to do to successfully map the ports to my Mac
was to map ports from the DSL modem to the AEBS, then
from AEBS to my Mac. Is this not right? Or is this
another kind of solution to the same problem, albeit
slightly more complicated to your suggestion above?
If the alcatel modem was just behaving as a modem then you would use the AEBS as the NAT device and do the port mapping on that. However the Alcatel modem is also a router.
If you setup up your alcatel router as a bridge you would then use the AEBS as your PPPoE client and then port mapping would work.

Port mapping reverts to blocking

I'm using an airport extreme to connect an Imac to a slimserver to play bbc radio via alienbbc.
This requires port mapping 554 which can be arranged via the advanced menus, my problem
is that when rebooting after software upgrades, airport seems to forget about this. More
explicitly, trying to initiate a bbc stream produces a console message indicating that the
connection on port 554 was "refused" and the connection is aborted. Getting
into the airport assistant, verifying that that this port is still mapped and then rebooting the
airport seems to bring it back, but this is quite a nuisance. If anyone has any advice on this
I would be most grateful.
This question was posed earlier in early October, but received no response.
Since then I've observed that the
reversion happens not only after upgrades, but occurs quite spontaneously. Since it takes
several minutes to restore the setting, I really hope that someone has some explanation that
will help to resolve the problem.

Hi Michael,
do you remeber how you solved this problem? We have exactly the same behaviour:
After a release change from BW 3.x to BW 7.0 we call an ABAP-based web template with http://<host>:8000... The browser automatically changes this URL to http://<host>:50000. How can we switch this off?
Thanks in advance and kind regards
Joerg

Quick question re: port mapping

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